Locomotive blast-pipe



E. HARLET.

LOCOMOTIVE BLAST PIPE. APPLICATION FILED Arm-10, 1919.

0 2. 9 1. 9 m 24 AU nm E J m n m P INVENTOR [rm/1 1a fli ATTORNEY E. HARLET.

LOCOMOTIVE BLAST PIPE.

APPLICATION FILED APR. 10, ms.

Patented June 29, 1920.

2 SHEET$SHEET 2.

PATENT OFFICE.

EMILE HARLETpOF FIVES-LILLE, FRANCE.

LOGOMOTIVE BLAST-PIPE.

Application filed April 10, 1919.

To all whom it may concern Be it known that I, EMILE HARLET, citizen of the Republic of France, and resident of Fives-Lille, (post-office address 19 Rue lierlioz, llorch) have invented certain new and useful improvements in Locomotive Blast-Pipes, which improvements are fully set forth in the following specification. The present invention has for its object to provide a blast pipe which cannot be put out of order and which is of constant height for locomotives, locomobiles and other apparatus which use exhaust steam, such blast pipe being of variable annular and central sections and which has its movement balanced.

This blast pipe, by the very form of the annular jet, insures a natural expansion of 'the steam, augmenting the surface of contact with the gases, and it permits, on the other hand, a direct evacuation of the steam without loss of velocity, by oifering it a greater section of evacuation than with the already known devices. These advantages are indicated by a diminution of the back pressure on the pistons and an economy in fuel.

The locomotive blast pipe which forms the subject matter of the present invention is represented, by way of example, in the accompanying drawings.

Figures 1 and 2 show, respectively, a view in vertical section and a view in plan of a blast pipe according to the invention, supposed to be in the open position.

Figs. 3 and 4 are similar views to the preceding ones, relating to the closed position.

Figs. 5 and 6 show, in front elevation and plan, one of the two valves constituting the device.

Fig. 7 is a detail diagram relating to a modification of the device which operates the valves.

Figs. 8 and 9 are views in vertical section and plan of another constructional form of the blast pipe, supposed to be in the closed position.

Figs. 10 and 11 show the blast pipe in the open position.

Figs. 12 and 13 show a view in vertical section and a view in plan of another blast pipe according to the present invention, supposed to be in the open position.

Fig. 14 is a view in plan of this blast pipe in the closed position.

Specification of Letters Patent.

Patented June 29, 1920.

Serial No. 289,086.

Reference will first be made to Figs. 1 to 6. It will be seen that the invention may be constituted by two valves I) placed in the blast pipe at and pivoted at their central part, on studs 0 fixed to the pipe and adapted to be operated by a lever d provlded with slots of suitable form, in which engage the cross-rods e fixed to the valves 6. In the position in which the blast pipe is completely open (see Figs. 1 and 2), the valves 6 are open at the bottom, leaving a central passage f for the steam the evacuation of which is thus effected in a direct manner and without loss of velocity. These valves, the use of which is double, leave also around them an annular passage 9 which is slightly larger at its lower .part, through which the steam escapes rapidly. By providing the blast pipe a with corrugations h. an expansion or mixing of the jet can be obtained which, by reason of its unequal thickness, insures a dilation of the steam at the outlet. It follows that the jet continues to expand, thus augmenting the surface of contact with the gases.

In the position in which the blast pipe is closed at the bottom (see Figs. 3 and 4c), the valves 6 are applied one against the other at the lower part and there is no longer any central jet. On the other hand these valves are separated at their upper part,.reducing to a minimum the section of the annular orifice. In this position of the valves, the annular jet escaping through the outer passage 9 is interrupted at z and c" by the flanged side edges of the valves, said edges extending out to the upper edge of pipe a so that the flanges thus act as obstructions which result in the formation of gaps in the jet at the said points z and i, the gaps facilitating the mixing of the steam.

These valves are of rounded form, as is shown in Figs. 5 and 6, and they have a greater curvature toward the top than toward the bottom so that they conjointly form a substantially conical element which is opened or closed according to the position of the valves; they are of very simple construction and do not need to be adjusted minutely. They have only, as a matter of fact, to make an approximate joint one against the other at their lower part or to make an approximate joint against the blast pipe a at the upper part.

he device cannot be put out of order owing to the fact that this pipe a is fixed and centered once for all.' The valves are, on the other hand, perfectly balanced, the

velocity of the steam has no influence upon them, and their action, which takes place without any friction, in no wise causes any wear on the operating parts the movement of which is furthermore, of very slight amplitude. The valves may be operated in different ways, for example, as shown in Fig. 7, by means of two gearteeth j and j forming. part of the pivot axle of'one valve and engaging with each other. The operation ofthe valve may then beefi'ectedby the squared end is provided on onecf the pivot axles.

In the constructional form represented in Figs. 8 to 11, the two valves 6 are pivoted to.a.common shaft Z carried by the pipe a, instead of.being-pivoted independently. ol each: other; in the open. position of the cone which, incidentally, is the closed position of the pipe (see Figs. 8 and 9), the valves virtually form joints againstthe pipe a, and allow only the annular orifice g to. exist, there being then no communication. between theouterorifice, or passage 9 and the cen tral space or passage f. Inthe open posi tion (see Figs. 10 and 11), the valveshav- .ingquittedtheir points of support against the, pipe, provide communication between the orificeor passageg and thecentral space fiandthereby leave. apassage forthe flow ofthesteam from theorifice g to the central orifice and its escapeby the-central orifice. These valves maybesoperated by two gear teethamkeyed onthe same. shaftin, or by any other device.

A.blastpipe with a central and an annular. section of evacuation may also beobtained by using the revolving cone device shownsin Figs. 12, 13, andl l. The pipe a is provided, aswill-be seen, with ribs 0 serving to support thefsegments of conical surface 1 which define. a space in which ro tatcs, abouth vertical axle 1, a piece formed by. the portions of the, cone 7 inunumber equal;tosthat of the segments 79. Inthe op cn position of the. blast pipe, there is a central passage. and an annular passage g,

and, in the. closed position, only this latter passageexists. The pipe may, itshou-ld be quiteunderstood, be provided with corruga tions, as in the arrangements with pivoted valves.

\Vhat I claim and desire to secure by Letters Patent oi the United States is 2- 1. A steam blast pipe of the character described, having arranged within it a pair of coacting valves, at least one of which is movable relatively to the other to open or close a central steam passage through them; said valves also providing a constantlyopen, annular steam passage between them and the wall of the pipe; and means for operating the movable valve.

2. A steam blast pipe of the character described, having arranged within it a pair of *pivotally-mounted, coacting valves movable relatively to each other to open or close a central steam passage through them; said valves also providinga constantly-open, annular steam passage of variable diameter between them and the wall of thepipe; and means for operating said valves.

3. A steam blast pipeol' the character dc scribed, having a corrugatedoutlet end; a pair of coacting valvesdisposed within said pipe, at least one of which valves is movable relatively to the. other to openior close. a central steam passage through them; said valves also providing a constantly-open, annular-steam passage between them and the wall of the pipe; and means for operating the movable valve.

4:; Asteam blastpipe of thecharacterde scribed, having arranged within it apair of coacting valves, at leastone ofwhich is movable. relatively to. the other to open or close a central steam passage through them; said valves also providing a constantlyopen, annular steam passage between them and the. wall ofthe pipe; cross-rods fixed to the topsof the rods; and a pivotally-mounted lever for operating the valves having slots wherein the cross-rods are engaged.

5. Asteam blast pipe of thecharacterdescribed, having arranged withinit apair of coacting valves, at least one. of; which is movable relativelyto the other to. open ,or

close. a central steam passage throughcthem;

said valves also providing a constantlyopen, annular steam passage between them and the wall of the, pipe; meansfor operating the movable valve; and means forinterrupting the-jet escapingat the mouth of the annular passage.

In testimony whereof I have signed this specification.

EMILE HARLET. 

